06-08 - M Roadsters and Coupes came with regular tires and a fix a flat kit and air compressor. I had a 04 prior to this M and I stayed with Run Flats but went with a softer tire. Bridgestone vs Kumho. Kumho's were less expensive and had a better ride. You will never get the ride of a regular tire with a run flat. They have come a long way since their creation and I am sure that they will get better still. But if given the choice between a run flat vs regular, give me regular any day. It just boils down to your risk factor.

You are correct, there are thousands of threads comparing RFT vs Regular and you won't get but two answers, go or no go.